최근의 코히어런트 광통신 기술의 발전에 힘있어, 차세대 대용량 광통신 분야에 있어서 기술혁신이 이루어지고 있다. 코히어런트 광통신 기술은 100Gbps급의 전송망에서 표준으로 채택되었을 뿐만 아니라, 그 이상의 속도를 가지는 광통신망을 실현할 유일한 대안으로 그 중요성이 더해갈 것으로 전망된다. 본 고에서는 그 중에서 직교위상변조기, 편광변환기, 편광분리기, 광하이브리드 및 밸런스 광검출기 등의 핵심 광부품기술의 현황 및 전망에 대해서 기술하였다.
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